Cartridge fuse



Aug. 7. 1923.

1,463,885 H. GOODWIN CARTRIDGE FUSE Filed June e, 1921 6a )Il I! III. IIL I *Q 15 15' v Q O Z. 11 jalfg (f1 5a A T'TOFNfY/S Patented ug. 7, 1923.

UNITED STATES ALL GOODWIN, 0F CHICAGO, ILLINOIS.

CARTRIDGE FUSE.

Application filed Juno 6,

To all wie om t ma-y concern:

Be it known that l, HALL GooDwiN, a citizen ot' the United btates, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Cartridge Fuses, ot which the following is a specification.

This invention relates to electrical fuses ot the cartridge type, and its object is to provide a simple and ellieient holder for the fusible element whirh enables said element to be readily removed for renewal when it is blown.

The invention also has lor its objectl to provide a simple means for guarding against overloading ot' the fuse.

The objects stated are attained by means o'f a novel combination and arrangement ot parts to be hereinafter described and claimed, and in order that the same may be better umlerstood, reference is had to the at1 companying drawing forming a part of this specilication.

In the drawing,

Fig. .l is an elevationot the device; Fig. 2 vis a central longitudinal section thereof; Figs. 3 and t are enlarged cross-sections on the lines Il--B and 4-4 of Fig. 2; Fig. 5 is a .perspective view of a portion ot the device, and Fig. G is a plan view ot' the .fusible element.

Referring specifically to the drawing, the body of the fuse holder is an elongated tubular easing which is iliade in two longitudinal and similar sections denoted by the reference characters 5 and 6, respectively, the same being'constructed of fiber or other nonconducting material. The ends of this casing are closed by being ittedwith heads of brassor other conduct-ing material, said heads being also made in two sections conforming to the casing sections. The head portions of the section 5 are shown at 5a, and those of the section 6 at 6, Tongueand-groove joints 7 are made between the longitudinal edges of the easing` sections 5 and G. This structure produces a tight joint to prevent the escape ot the flame when the fuse blows. However, the joint is not airtight and hence the escape ot fumes trom the casing when the fuse blows is not prevented. The head sections 5a and 6a fit over the ends ot the casing sections 5 and G, and they will be die east and provided on the inside with pins 8 to enter holesl in the casing sections for securing said parts in as- 1921. Serial No. 475,354.

senibled relation, the pins being riveted on the inside of the casing sections. The

tongue-ainl-groove joints 7 are not continued through the head sections 5u and 6a, the contiguous edges thereof being left smooth. However, the sections 5 have edge lugs 9 to seat in edge recesses l0 in the sections f, and thereby prevent the easing sections 5 and G from shifting lengthwise with respect to each other. These lugs and recesses at the respective ends ot the casing are on diametrically opposite sides so as to enable either section 5n to be placed opposite either section v(5", and also to enable said sections 5il and G, respectively, to be cast alike.

Over the headed ends of the casing hereinbetore described are. removably fitted terminal caps ll and l2, respectively, which are made of brass or other conducting material. The sides ot these caps lit snugly against the sides ot the heads composed of the sections connection. and to assure such connection, the ends ot the caps ma),v be provided with contact screws 13 which are threaded through said ends to come into positive contact with the ends ot the 'fusible element to be presently described. These screws are headed on the inside olf the caps, as shown atv 13a, so that they cannot get lost by screwing out of the cap ends.

5fL and (3 to obtain an electrical- .The terminal caps 1l and 12 are locked i against endwise separation from the headed ends of the casing, by projectingr side pins .lll carried by the head sections 5 and 6 and seating in angular slots in the sides of the caps. These slots extend lengthwise of the caps from their inner ends, for a short distance, as shown at l5. and then extend laterally. as shown at 15a. In applying the caps they are placed so that the inner portions 15 ot the slots are in line vwith the pins la, whereupon the caps can be slid inwardly. and when the pins reach the lateral bram-hes i5Z1 theraps are given a turn to seat the pins therein. which completes the coupling operation. lt will be noted that the lateral portions 15" of the slots are inclined in a` direction to draw the caps inwardly when the pins I4 pass along the same. It will also be noted that the locking pins of the caps il and 1Q are not diametrieallyy opposite ear-h other. the pins on the head sections 5f being centrally located, whereas the pins ot the Corresponding seotions 6a are ott' rente. about 4.5 degrees. The

in contact with said ends.

pins of the sections 6a are also offset relative 'to each other. This arrangement of the pin assures proper assembly of the caps so that the contact screws will always come opposite the ends of the fusible element.

The casin hereinbefore described encloses a fusibz element in the form of a strip or ribbon 16 carried by'a shell 17 of noncombustible and non-conducting material. This shell is filled with a non-combustible and non-conducting material, such as plaster of Paris or asbestos fiber, as shown at 18, and the stri 16 is embedded in this filler and extends lengthwise through the same, its length being such that it has its ends projecting from the ends of the shell. The projecting end portions of the fusible strip' are adapted to be placed between the ends of the heads composed ot the sections 5 and 6, the sections 6a having shallow end recesses 19 to seat the strip ends. The ends of the strip 16 are bent laterally on the outside of the heads, so that when the terminal caps 11 and 12 are applied the screws 13 may come One end of the strip 16 projects a sufficient distance so that it may also be bent over against the side of the head section 6a at the corresponding end of the holder, said section having an external side groove 20 to seat this portion of the strip, the offset position of the pin 14 on this section permitting the groove to be made therein. The enclosed portion of the fusible strip 16 has -perforations 21`l and its lastdescribed end is marked to indicate the rat-- ing or current capacity of the fuse, the casing 6 adjacent to the head section 4(3a-whichl has the groove 20 being correspondingly marked. It is to be understood that a fusible element designed for the current capacity indicated on the holder should be selected, and as thisis indicated on the strip-16 it is ,made impossible, when ordinary care is exercised, to overload the fuse.

A fuse holder constructed as hereinbefore described s simple and efficient, and after the parts are properly assembled there is nothing to get loose or out of order. When the fuse blows, the holder can be readily taken apart for renewing of the fusible element, it being necessary only to take off the terminal caps 11 and 12, after which the sections 5 and 6 can be separat-ed. The cap 11 has ablade 11a so that the holder can be used in connection with a knife switch.

I claim:

1. A fuse-holder comprising an elongated tubular casing which is in two lon itudinal and similar separable sections, hea s of conducting material on the ends of the casing, said heads being also in sections, terminal caps slidably and removably fitted over the heads for coupling the casing sections together, the caps having angular slots and the head sections having projecting side pins adapted to enter said slots, the pins of the respective head sections being positioned obliquely relative to each other, contact screws carried by the caps and having their inner ends located opposite the ends of the heads, and a fusible element held between the casing sections and having end portions extending between the head sections and projectingr therefrom to extend across outer ends of said head sections for engagement by the contact screws.

2. A fuse-holder comprising an elongated tubular casing which is in two longitudinal and similar separable sections, heads of conducting material on the ends of the casing, said heads being also in sections, terminal caps slidably and removably fitted over the heads for coupling the casin sections together, contact screws carrier. by the caps and having their inner ends located oppo` site the ends of the heads, and a fusible element in the casing and having end portions extending between the head sections and projecting therefrom for engagement by the contact'screws.

In testimony whereof I aflix my signature.

HALL GOODlVIN. 

